In my experience, the size and design of that reservoir is tough to bleed with a high flow system. I have one at the top of a mid tower with a Maze3, DD GPU block, Via Aqua 1300 pump and it wouldn't bleed. Flow is around 85GPH. The flow hits the sidewall and churns up air bubbles that get recycled through the system. I could pinch a hose and slow the flow to a crawl till it bled, top off the res, unpinch the hose and it still churned up the small amount of air in the top of the res and got foamy again.
To fix mine I inserted a small strip of [plastic] window screen around the inside diameter of the res. I cut most of the threads off the cap so I can fill the res to a higher level without the coolant wicking up and out the threads while I tightened the cap. Flow dropped to like 82GPH and the screen seems to seperate the air from the water so it doesn't get drawn down to the outlet. Drawback, if you got junk in your coolant, it can get caught in the screen and reduce or block flow. I have seen some guys stick a foam block (like the one they get with the Eheim 1250's) in there too. With your flow rate, this may not work at all.
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